Within the root of your website, create a file folder named

scripts and create a shipping.js file within it$.$

o This file will contain the JavaScript for this

assignment.

Code the $$()$ function at the top of the file

$$ Add an event handler for DOMContentLoaded

Attach a function named calculate to the click

event of the Calculate button

Move focus to the product cost text box

$$ calculate function

Parse the product cost

Check to see if product cost is a valid number that

is greater than zero

If so$,$ pass the product cost to a function

named calculateShipping

If not, throw an alert with an appropriate

message

Leave focus on product cost

@ calculateShipping function

Accept product cost as a parameter

The shipping cost will be calculated as a

percentage of the product cost, according to the

following table:

The function should return the sum of the product

cost and the shipping cost